August 21, 2026·7 min read

Landscape Architect Hourly Rate vs Fixed Fee: How to Choose

Hourly rate vs fixed fee for landscape architects—learn which pricing model protects your margin and when to switch based on project type.

Most landscape architecture firms default to one fee structure and stick with it regardless of project type. That default costs them money. The right choice between hourly and fixed fee depends on scope clarity, client type, and your firm's internal tracking discipline—and getting it wrong on a single mid-size project can erase a month of profit.

Why This Decision Matters More Than Your Billing Rate

Your billing rate is a number. Your fee structure is a system. A principal billing at $185/hr on a poorly scoped fixed-fee project will net less than a junior designer billing at $95/hr on a well-run hourly engagement. The structure determines whether scope creep becomes your problem or your client's problem. It also determines how much administrative overhead your PMs carry every month.

Firms that treat this as a one-time policy decision—"we do fixed fee"—tend to lose money on complex projects and leave money on the table on simple ones. The firms that do it well make the call project by project, using a short set of criteria they've actually written down.

How Hourly Billing Works in Practice

Hourly billing means you track time against agreed billing rates, invoice based on actual hours, and the client absorbs scope additions automatically. Your exposure is limited to write-offs and collection risk, not unbounded labor overruns.

The math is straightforward. If your PM bills at $155/hr and spends 14 hours on a planning commission revision cycle that wasn't in the original scope, you invoice for it. The client may push back, but you have a paper trail. On projects with genuinely uncertain scope—entitlement work, phased master plans, anything requiring iterative agency coordination—hourly is almost always the right call.

The downside is real: some clients won't accept open-ended billing, and hourly arrangements require rigorous time tracking to invoice accurately. If your team's timesheets are three weeks behind, hourly billing becomes a liability.

How Fixed Fee Works in Practice

Fixed fee means you've estimated the total hours, applied your rates, added a contingency buffer, and presented a single number. The client knows their exposure. You know your target. If you finish under budget, you keep the difference. If you blow past it, you absorb the loss.

A typical fixed-fee calculation looks like this:

Phase	Est. Hours	Blended Rate	Phase Fee
Schematic Design	48 hrs	$135/hr	$6,480
Design Development	62 hrs	$135/hr	$8,370
Construction Documents	95 hrs	$130/hr	$12,350
Bidding Support	18 hrs	$125/hr	$2,250
Total	223 hrs		$29,450

Add a 12–15% contingency buffer to that total before presenting it. On a $29,450 estimate, that's $3,300–$4,400 in contingency, bringing your proposal to roughly $32,750–$33,850. Firms that skip the contingency buffer are the ones calling clients to renegotiate fees mid-project.

When to Use Hourly vs Fixed Fee

This is the actual decision framework, not a theoretical one.

Use hourly when:

Scope involves agency discretion (planning commissions, design review boards, CEQA responses)
Client has a history of design changes after approval
The project type is new to your firm and your hour estimates aren't reliable
It's a public sector client with change order capacity built into their process

Use fixed fee when:

Scope is tightly defined with a clear deliverable list
Client is private sector and wants budget certainty
You've done this project type at least four times and your estimates are within 10% of actuals
The project has a hard deadline that aligns incentives—you both want it done efficiently

The hybrid approach works well on larger projects: fixed fee for SD through CDs, hourly for CA. Construction administration is almost impossible to scope accurately because RFI volume, contractor performance, and owner-initiated changes are outside your control.

The Margin Math Behind Each Model

Fixed fee looks more profitable on paper because the upside is real—finish in 180 hours on a 220-hour estimate and you've just made an extra $5,200 at a $130 blended rate. But the downside is asymmetric. That same project running 40 hours over budget costs you the same $5,200, and you can't always bill for it.

Hourly billing has a more predictable margin profile. If your overhead rate is 1.65 and your direct labor cost for a PM is $72/hr, your breakeven billing rate is $118.80/hr. Billing that PM at $155/hr gives you a 23% profit margin on their time before firm overhead allocation. That margin is consistent regardless of how many hours the project takes.

The firms that make fixed fee work well do two things: they track hours against budget in real time (not at invoice time), and they enforce scope change orders before doing the work, not after. Both require discipline and tooling.

Scope Creep Is a Fee Structure Problem, Not a Client Problem

Scope creep happens on both billing models, but it hits differently. On hourly, creep becomes additional revenue if you're tracking and invoicing it. On fixed fee, creep becomes absorbed cost unless you've written your contract to define what triggers a change order.

Your contract should specify: how many rounds of design review are included, what constitutes a "revision" versus a "change in scope," and which deliverables are covered by each phase fee. Vague language like "design services through construction documents" will be interpreted differently by every client. Specific language like "two rounds of design review per phase; additional rounds billed at $145/hr" gives you a defensible position.

The other piece is response time. Issuing a change order after you've already done the work is a negotiation, not an invoice. Issuing it before—"I can get you that additional planting plan revision, here's the change order for 6 hours at $145/hr"—is standard professional practice. Most clients will approve it.

Common Mistakes Firms Make

1. Using fixed fee on entitlement-heavy projects. Any project that requires discretionary approval from a planning body or design review committee is not fixed-fee territory. The number of meetings, revision cycles, and resubmittals is outside your control.

2. Skipping the contingency buffer. Presenting a fixed fee without a 12–15% buffer means your estimate has to be perfect. It won't be. Build the buffer in before you present the number.

3. Tracking hours only at invoice time. If your team logs time weekly but you only review it when invoices go out, you'll discover you're over budget after it's too late to do anything about it. Budget vs. actual needs to be a weekly check, not a monthly one.

4. Writing scope language that's too vague. "Landscape architecture services for the project" is not a scope. If you can't list the specific deliverables and the number of review rounds included, you haven't scoped the project yet.

5. Never renegotiating a fixed fee mid-project. Some projects genuinely change—owner pivots, site conditions, regulatory shifts. Principals who absorb those changes silently to avoid an awkward conversation end up with a team that's demoralized and a project that loses money. Have the conversation early.

6. Applying the same fee structure to all clients regardless of relationship. A repeat client who communicates clearly and approves things quickly is a different risk profile than a first-time client with three internal stakeholders. Your fee structure can reflect that.

How Phasewise Handles This

The place where hourly vs. fixed fee decisions fall apart operationally is in real-time budget tracking. Phasewise shows budget vs. actual hours by phase as time gets logged, so you're not discovering a fixed-fee project is 30% over budget when you're writing the invoice. The phase-level budget tracking is also what makes hybrid fee structures manageable—you can run CA as hourly and SD through CDs as fixed fee on the same project without juggling two separate systems.